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D( x )
6*x = 0
6*x-4 = 0
6*x = 0
6*x = 0
6*x = 0 // : 6
x = 0
6*x-4 = 0
6*x-4 = 0
6*x-4 = 0 // + 4
6*x = 4 // : 6
x = 4/6
x = 2/3
x in (-oo:0) U (0:2/3) U (2/3:+oo)
(7*x+1)/(6*x) = (4*x+2)/(6*x-4) // - (4*x+2)/(6*x-4)
(7*x+1)/(6*x)-((4*x+2)/(6*x-4)) = 0
(7*x+1)/(6*x)+(-1*(4*x+2))/(6*x-4) = 0
((7*x+1)*(6*x-4))/(6*x*(6*x-4))+(-1*6*x*(4*x+2))/(6*x*(6*x-4)) = 0
(7*x+1)*(6*x-4)-1*6*x*(4*x+2) = 0
18*x^2-34*x-4 = 0
18*x^2-34*x-4 = 0
2*(9*x^2-17*x-2) = 0
9*x^2-17*x-2 = 0
DELTA = (-17)^2-(-2*4*9)
DELTA = 361
DELTA > 0
x = (361^(1/2)+17)/(2*9) or x = (17-361^(1/2))/(2*9)
x = 2 or x = -1/9
2*(x+1/9)*(x-2) = 0
(2*(x+1/9)*(x-2))/(6*x*(6*x-4)) = 0
(2*(x+1/9)*(x-2))/(6*x*(6*x-4)) = 0 // * 6*x*(6*x-4)
2*(x+1/9)*(x-2) = 0
( x+1/9 )
x+1/9 = 0 // - 1/9
x = -1/9
( x-2 )
x-2 = 0 // + 2
x = 2
x in { -1/9, 2 }
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